@article{DE_1996_32_4_a6,
     author = {S. G. Kondratenya},
     title = {Second-order equations without moving essentially singular points},
     journal = {Differencialʹnye uravneni\^a},
     pages = {484--490},
     publisher = {mathdoc},
     volume = {32},
     number = {4},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1996_32_4_a6/}
}